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D. Still All Experimenters Meeting Dec 21, 2009

Crystal Collimator Studies in the Tevatron T-980 Collaboration: FNAL, SLAC, BNL, CERN, PNPI, IHEP, INFN. D. Still All Experimenters Meeting Dec 21, 2009. Outlook. Quick Crystal Collimation Explanation Recent System Additions/Changes Channeling for the new O-05-09 crystal.

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D. Still All Experimenters Meeting Dec 21, 2009

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  1. Crystal Collimator Studies in the TevatronT-980 Collaboration:FNAL, SLAC, BNL, CERN, PNPI, IHEP, INFN D. Still All Experimenters Meeting Dec 21, 2009

  2. Outlook • Quick Crystal Collimation Explanation • Recent System Additions/Changes • Channeling for the new O-05-09 crystal. • Collimating Volume Reflected (VR) Beam at F172H collimator. • Beam Plans for 2010 AEM - Dec 21, 2009 - D. Still

  3. 1 2 5 Ray Fliller- Halo 03 Explanation of Crystal Channeling AEM - Dec 21, 2009 - D. Still

  4. T980 Work Jan-April 2009 Multistrip crystal: both volume reflection (F172) and multi-channeling (E03) work at Tevatron Miscut angle: make it small (≤ 0.2 mrad) and negative for partial or full channeling Also used crystal collimation for 4 HEP stores to gain operational experience and understanding of efficiency. AEM - Dec 21, 2009 - D. Still

  5. New Vertical Goniometer Up and Downstream Motion control and LVDT Up and Downstream Laser angle measurement instruments AEM - Dec 21, 2009 - D. Still

  6. T980 Setup in Tevatron E0 for 2009-2010 F1 F172H Collimator Horizontal Volume Reflected Beam (VR) Path B0 23.731 m 33.115 m E03H Collimator Channeled Beam Path Bent Crystal E0 D0 Removed B2-3 dipole Installed new Vertical goniometer with 2 crystals 4 m upstream of the Horizontal gonoimeter Also Installed new detectors And hardware at F17 to dectect Volume reflected beam (VR) AEM - Dec 21, 2009 - D. Still

  7. Goniometer Installations over Summer 09 Shutdown Newly built and installed (Summer 2009) Vertical goniometer at E0. It is ~ 4m upstream of the Hor. one. Ver. goniometer houses old O-shaped crystal (reversed for negative miscut) and multi-strip crystal. Modified horizontal goniometer. Replaced old large-miscut angle O-shaped crystal with new small miscut O-shaped during Summer 2009. AEM - Dec 21, 2009 - D. Still

  8. New Characterized Crystals Name: O-01-09 Bend: 315urad Miscut:195urad New New Name: MS-08-09 Bend: 63urad (VR) Broken during installation Installed VerDnstrmgoniometer Name: O-05-09 Bend: 360urad Miscut: 120urad New Name: O-BNL-02 Bend: 410urad Miscut: 1600 urad Installed Horgoniometer Installed VerUpstrmgoniometer AEM - Dec 21, 2009 - D. Still

  9. Outlook • Quick Crystal Collimation Explanation • Recent System Additions • Channeling for the new O-05-09 crystal. • Collimating Volume Reflected (VR) Beam at F172H collimator. • Beam Plans for 2010 AEM - Dec 21, 2009 - D. Still

  10. First 980-GeV Beam Test with New Hor Crystal New detector at F17 Channeled beam (abort gap) Channeled into E03 collimator channel AEM - Dec 21, 2009 - D. Still

  11. E03H Coll Scan compare 2005,2008,2009O-BNL-02 to O-05-09 crystals New Hor Crystal Previous used BNL Crystal AEM - Dec 21, 2009 - D. Still

  12. Compare BNL to O-05-09 2008 O-BNL-02 sigma=30 urad 2009 O-05-09 sigma = 16 urad AEM - Dec 21, 2009 - D. Still

  13. Outlook • Quick Crystal Collimation Explanation • Recent System Additions • Channeling for the new O-05-09 crystal. • Collimating Volume Reflected (VR) Beam at F172H collimator. • Beam Plans for 2010 AEM - Dec 21, 2009 - D. Still

  14. VR Beam at F172H Collimators VR Beam should be ~ .9mm from core For ~ VR angle of 16urad. Result of ring orbit for 16urad Kick simulating effect of VR kick. AEM - Dec 21, 2009 - D. Still

  15. November 2, 2007 A.Drozhdin At E03H Collimator At F172H Collimator Extracted and circulating beams position in the Tevatron at collimation in horizontal plane with 3-mm channeling crystal located at EO straight section. Transverse plane is shown at EO3 (left) and F172 (right) collimators entrance for particles with momentum dP/P=0 (top), dP/P=-0.0002 (middle) and both (bottom).

  16. Finding VR beam at F17 Maybe Collimated VR beam Displacement difference ~ 45 mils or 1.125 mm F172H scan w/ angle at channel -970urad. F172H scan w/ angle at VR -882urad AEM - Dec 21, 2009 - D. Still

  17. F172H Collimation CH,VR,AM beam AEM - Dec 21, 2009 - D. Still

  18. Summary & Continued Beam Studies • Encouraged thus far by results of O-05-09, still need some instrumentation improvements at F17 to help detect the VR beam. • Still are working on front end software for the vertical goniometer. • Once vertical goniometer is ready, there will be a number of EOS requests. • Investigate 2 plane crystal channeling. • Investigate use of crystal collimation with a multi-strip crystal. AEM - Dec 21, 2009 - D. Still

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